Prettify error backtrace when logging.

Prettify error backtrace when logging.

diff --git a/lib/message_bus/backends/redis.rb b/lib/message_bus/backends/redis.rb
index d62bc20..4790ca9 100644
--- a/lib/message_bus/backends/redis.rb
+++ b/lib/message_bus/backends/redis.rb
@@ -318,7 +318,7 @@ LUA
             end
           end
         rescue => error
-          @logger.warn "#{error} subscribe failed, reconnecting in 1 second. Call stack #{error.backtrace}"
+          @logger.warn "#{error} subscribe failed, reconnecting in 1 second. Call stack #{error.backtrace.join("\n")}"
           sleep 1
           global_redis&.disconnect!
           retry

GitHub sha: be78b36b